Weight-bearing deficiency of the 1st metatarsal ray.

The authors have analysed a special disturbance of the statics and dynamics of the forefoot - deficient weight-bearing on the first metatarsal ray whilst walking. From the clinical point of view, the condition resulted in the development of a dorsal bunion and metatarsalgia. Forty-nine cases were treated and seven causative factors were discovered: Club foot, Paralysis, Congenital deformity, Fracture-dislocation of Lisfranc's joint, Sequelae of surgery for hallux valgus, Sequelae of subtaler arthrodesis, "Functional" abnormality.